Westlake Corp (WLK) stock
WLKNYSEIndustrial Organic ChemicalsFiscal year ends December 31
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 5, 2026Score 9/3039% below fair value
$68.28+2.27 (+3.44%)
Close on Oct 30, 2026Market cap $8.73BP/E –Yield 3.09%
Price history
Westlake share prices for every month, newest first. Adjusted for stock splits, not for dividends.
Close, Oct 30, 2026
$68.28
+3.44% on the day
52-week range
$56.33 – $124.23
-45.0% from the high
Change over 52 weeks
-0.0%
From $68.29 on Oct 30, 2025
Average volume
977,424
Shares a day, last 90 sessions
| Month | Open | High | Low | Close | Change | Volume |
|---|---|---|---|---|---|---|
| Oct 2026 | $60.66 | $68.35 | $58.95 | $68.28 | +9.58% | 22,027,767 |
| Sep 2026 | $75.02 | $77.45 | $62.30 | $62.31 | -17.00% | 15,131,417 |
| Aug 2026 | $70.16 | $80.98 | $68.70 | $75.07 | +6.48% | 21,241,654 |
| Jul 2026 | $71.86 | $79.84 | $68.48 | $70.50 | -3.42% | 23,750,245 |
| Jun 2026 | $87.50 | $89.47 | $72.71 | $73.00 | -15.93% | 22,779,775 |
| May 2026 | $115.75 | $117.05 | $86.08 | $86.83 | -24.68% | 24,651,166 |
| Apr 2026 | $117.00 | $124.23 | $109.14 | $115.28 | -1.32% | 21,395,789 |
| Mar 2026 | $103.32 | $119.69 | $99.34 | $116.82 | +10.86% | 29,726,155 |
| Feb 2026 | $79.89 | $107.99 | $78.61 | $105.38 | +32.85% | 27,512,968 |
| Jan 2026 | $74.57 | $91.08 | $72.69 | $79.32 | +7.28% | 28,683,139 |
| Dec 2025 | $65.50 | $76.33 | $65.50 | $73.94 | +10.67% | 35,125,071 |
| Nov 2025 | $69.00 | $70.62 | $56.33 | $66.81 | -2.91% | 28,580,318 |
| Oct 2025 | $76.52 | $83.48 | $65.77 | $68.81 | -10.71% | 29,095,577 |
| Sep 2025 | $86.39 | $92.22 | $75.03 | $77.06 | -12.25% | 21,226,727 |
| Aug 2025 | $78.40 | $91.23 | $75.07 | $87.82 | +10.74% | 28,000,824 |
| Jul 2025 | $75.54 | $88.51 | $75.39 | $79.30 | +4.44% | 25,412,012 |
| Jun 2025 | $71.05 | $81.54 | $68.55 | $75.93 | +6.90% | 27,977,924 |
| May 2025 | $92.81 | $94.18 | $69.47 | $71.03 | -23.15% | 33,109,178 |
| Apr 2025 | $99.54 | $102.12 | $81.41 | $92.43 | -7.60% | 15,773,220 |
| Mar 2025 | $113.86 | $114.75 | $97.37 | $100.03 | -10.93% | 18,660,040 |
| Feb 2025 | $111.60 | $118.23 | $104.74 | $112.30 | -1.72% | 12,805,404 |
| Jan 2025 | $114.92 | $119.86 | $108.95 | $114.27 | -0.33% | 11,013,803 |
| Dec 2024 | $128.67 | $129.27 | $112.63 | $114.65 | -10.71% | 13,510,266 |
| Nov 2024 | $131.75 | $139.59 | $125.28 | $128.40 | -2.68% | 11,641,946 |
| Oct 2024 | $150.23 | $150.85 | $131.07 | $131.94 | -12.21% | 9,149,185 |
| Sep 2024 | $143.53 | $151.56 | $132.80 | $150.29 | +3.33% | 10,460,983 |
| Aug 2024 | $147.71 | $153.34 | $129.98 | $145.44 | -1.64% | 9,335,534 |
| Jul 2024 | $145.37 | $151.86 | $139.38 | $147.86 | +2.10% | 9,261,097 |
| Jun 2024 | $160.96 | $160.96 | $143.59 | $144.82 | -9.80% | 11,483,018 |
| May 2024 | $150.06 | $161.31 | $144.27 | $160.56 | +8.96% | 9,178,592 |
| Apr 2024 | $152.91 | $162.64 | $146.62 | $147.36 | -3.56% | 9,958,359 |
| Mar 2024 | $138.60 | $153.14 | $136.36 | $152.80 | +10.16% | 7,773,463 |
| Feb 2024 | $139.13 | $145.98 | $118.64 | $138.71 | +0.26% | 8,701,423 |
| Jan 2024 | $140.33 | $142.62 | $132.20 | $138.35 | -1.15% | 6,123,334 |
| Dec 2023 | $128.15 | $143.61 | $125.87 | $139.96 | +9.01% | 6,504,572 |
| Nov 2023 | $115.08 | $131.38 | $113.95 | $128.39 | +11.30% | 7,551,539 |
| Oct 2023 | $123.96 | $127.82 | $112.77 | $115.36 | -7.47% | 9,345,354 |
| Sep 2023 | $132.35 | $133.83 | $120.28 | $124.67 | -4.82% | 10,355,212 |
| Aug 2023 | $136.21 | $137.49 | $128.39 | $130.98 | -4.74% | 10,493,205 |
| Jul 2023 | $119.73 | $138.39 | $114.23 | $137.50 | +15.09% | 9,277,007 |
| Jun 2023 | $104.20 | $119.92 | $103.28 | $119.47 | +14.93% | 11,307,090 |
| May 2023 | $113.19 | $122.98 | $103.28 | $103.95 | -8.64% | 10,869,576 |
| Apr 2023 | $117.00 | $120.06 | $108.75 | $113.78 | -1.90% | 8,051,957 |
| Mar 2023 | $119.28 | $125.09 | $102.64 | $115.98 | -2.65% | 12,308,313 |
| Feb 2023 | $122.17 | $126.32 | $113.52 | $119.14 | -2.94% | 10,680,732 |
| Jan 2023 | $102.75 | $122.75 | $98.05 | $122.75 | +19.71% | 11,137,972 |
| Dec 2022 | $108.90 | $112.73 | $101.14 | $102.54 | -4.75% | 10,595,156 |
| Nov 2022 | $98.28 | $113.51 | $87.93 | $107.65 | +11.38% | 17,613,360 |
| Oct 2022 | $88.85 | $100.08 | $85.37 | $96.65 | +11.25% | 25,109,240 |
| Sep 2022 | $97.27 | $102.94 | $81.29 | $86.88 | -11.91% | 17,176,482 |
| Aug 2022 | $96.00 | $110.30 | $91.87 | $98.63 | +1.33% | 16,800,862 |
| Jul 2022 | $96.96 | $100.03 | $89.00 | $97.34 | -0.69% | 13,481,995 |
| Jun 2022 | $132.43 | $136.55 | $91.88 | $98.02 | -25.80% | 19,884,144 |
| May 2022 | $127.05 | $141.19 | $122.19 | $132.11 | +4.39% | 21,476,369 |
| Apr 2022 | $124.42 | $135.47 | $111.45 | $126.55 | +2.55% | 14,911,931 |
| Mar 2022 | $110.39 | $127.21 | $104.88 | $123.40 | +11.87% | 15,196,840 |
| Feb 2022 | $98.99 | $111.49 | $98.81 | $110.31 | +11.82% | 12,088,619 |
| Jan 2022 | $98.05 | $109.01 | $93.55 | $98.65 | +1.56% | 13,109,168 |
| Dec 2021 | $95.06 | $99.81 | $88.41 | $97.13 | +4.53% | 10,634,305 |
| Nov 2021 | $97.43 | $104.99 | $92.29 | $92.92 | -4.54% | 12,930,540 |
| Oct 2021 | $91.48 | $103.72 | $90.43 | $97.34 | +6.80% | 11,309,974 |
| Sep 2021 | $87.78 | $94.50 | $80.47 | $91.14 | +4.34% | 12,661,804 |
| Aug 2021 | $83.45 | $88.84 | $79.88 | $87.35 | +5.34% | 15,129,506 |
| Jul 2021 | $91.46 | $92.22 | $78.06 | $82.92 | -7.96% | 12,339,433 |
| Jun 2021 | $102.49 | $106.47 | $88.65 | $90.09 | -10.69% | 12,010,294 |
| May 2021 | $95.08 | $105.84 | $93.15 | $100.87 | +7.43% | 9,236,723 |
| Apr 2021 | $89.85 | $97.80 | $87.20 | $93.89 | +5.74% | 12,307,030 |
| Mar 2021 | $87.23 | $97.26 | $83.82 | $88.79 | +3.74% | 21,347,079 |
| Feb 2021 | $77.80 | $90.36 | $77.66 | $85.59 | +11.94% | 10,565,674 |
| Jan 2021 | $83.16 | $91.83 | $74.42 | $76.46 | -6.30% | 6,279,538 |
| Dec 2020 | $77.30 | $84.90 | $76.39 | $81.60 | +8.58% | 6,127,551 |
| Nov 2020 | $68.70 | $81.08 | $68.30 | $75.15 | +11.14% | 7,015,943 |
| Oct 2020 | $63.66 | $73.14 | $60.84 | $67.62 | +6.96% | 6,383,111 |
| Sep 2020 | $59.26 | $68.81 | $58.48 | $63.22 | +6.57% | 8,981,470 |
| Aug 2020 | $54.98 | $65.81 | $54.20 | $59.32 | +8.84% | 8,767,503 |
| Jul 2020 | $54.09 | $58.60 | $50.38 | $54.50 | +1.58% | 11,804,865 |
| Jun 2020 | $47.72 | $60.42 | $47.43 | $53.65 | +12.47% | 14,934,558 |
| May 2020 | $42.35 | $49.56 | $36.09 | $47.70 | +9.78% | 16,275,029 |
| Apr 2020 | $36.40 | $47.19 | $34.02 | $43.45 | +13.83% | 14,853,450 |
| Mar 2020 | $56.50 | $58.93 | $28.99 | $38.17 | -31.68% | 27,027,543 |
| Feb 2020 | $61.45 | $68.15 | $51.14 | $55.87 | -8.71% | 16,364,967 |
| Jan 2020 | $70.61 | $71.87 | $60.80 | $61.20 | -12.76% | 9,494,277 |
| Dec 2019 | $69.15 | $72.67 | $65.58 | $70.15 | +2.14% | 8,278,100 |
| Nov 2019 | $63.57 | $75.65 | $63.47 | $68.68 | +8.69% | 11,977,980 |
| Oct 2019 | $66.01 | $66.96 | $57.75 | $63.19 | -3.56% | 12,352,347 |
| Sep 2019 | $57.49 | $71.13 | $56.01 | $65.52 | +11.83% | 10,478,651 |
| Aug 2019 | $67.57 | $67.82 | $55.82 | $58.59 | -13.29% | 14,054,732 |
| Jul 2019 | $65.00 | $70.56 | $64.40 | $67.57 | -2.72% | 15,762,363 |
| Jun 2019 | $57.58 | $70.30 | $57.40 | $69.46 | +21.24% | 18,143,841 |
| May 2019 | $69.63 | $69.76 | $57.20 | $57.29 | -17.86% | 24,571,944 |
| Apr 2019 | $68.86 | $78.08 | $68.62 | $69.75 | +2.79% | 19,625,235 |
| Mar 2019 | $70.64 | $72.02 | $64.48 | $67.86 | -2.88% | 16,898,864 |
| Feb 2019 | $73.78 | $81.04 | $69.66 | $69.87 | -5.45% | 20,860,393 |
| Jan 2019 | $65.00 | $79.23 | $64.99 | $73.90 | +11.68% | 17,767,085 |
| Dec 2018 | $74.41 | $75.25 | $59.78 | $66.17 | -8.72% | 14,826,628 |
| Nov 2018 | $72.55 | $81.49 | $66.91 | $72.49 | +1.67% | 16,635,727 |
| Oct 2018 | $83.11 | $85.95 | $68.40 | $71.30 | -14.21% | 20,311,893 |
| Sep 2018 | $94.03 | $95.00 | $81.88 | $83.11 | -12.12% | 17,856,423 |
| Aug 2018 | $107.20 | $109.87 | $92.77 | $94.57 | -11.80% | 19,950,314 |
| Jul 2018 | $108.00 | $112.85 | $102.63 | $107.22 | -0.38% | 13,655,495 |
| Jun 2018 | $117.37 | $119.77 | $103.33 | $107.63 | -7.00% | 18,285,961 |
| May 2018 | $106.25 | $124.30 | $102.08 | $115.73 | +8.19% | 19,741,925 |
| Apr 2018 | $110.76 | $115.15 | $102.63 | $106.97 | -3.76% | 18,080,169 |
| Mar 2018 | $108.15 | $121.30 | $105.24 | $111.15 | +2.67% | 15,180,835 |
| Feb 2018 | $112.57 | $113.31 | $98.32 | $108.26 | -3.85% | 16,698,743 |
| Jan 2018 | $106.97 | $115.19 | $106.51 | $112.60 | +5.70% | 15,002,299 |
| Dec 2017 | $98.48 | $107.51 | $96.43 | $106.53 | +8.78% | 15,289,295 |
| Nov 2017 | $85.90 | $98.12 | $84.89 | $97.93 | +15.33% | 20,715,150 |
| Oct 2017 | $82.94 | $87.22 | $82.28 | $84.91 | +2.19% | 14,382,044 |
| Sep 2017 | $77.38 | $84.58 | $75.92 | $83.09 | +8.04% | 16,907,974 |
| Aug 2017 | $70.56 | $77.31 | $68.60 | $76.91 | +9.31% | 21,195,611 |
| Jul 2017 | $66.59 | $71.44 | $65.41 | $70.36 | +6.27% | 13,424,894 |
| Jun 2017 | $61.53 | $66.81 | $61.23 | $66.21 | +7.73% | 18,727,063 |
| May 2017 | $62.52 | $67.82 | $59.58 | $61.46 | -1.27% | 21,761,638 |
| Apr 2017 | $66.25 | $67.86 | $61.73 | $62.25 | -5.75% | 17,317,572 |
| Mar 2017 | $64.17 | $68.08 | $62.74 | $66.05 | +4.13% | 17,759,241 |
| Feb 2017 | $61.75 | $66.83 | $61.05 | $63.43 | +2.46% | 18,702,012 |
| Jan 2017 | $56.65 | $65.02 | $56.35 | $61.91 | +10.57% | 16,951,049 |
| Dec 2016 | $59.97 | $61.53 | $55.83 | $55.99 | -5.37% | 16,647,425 |
| Nov 2016 | $52.21 | $59.48 | $48.92 | $59.17 | +14.25% | 21,975,331 |
| Oct 2016 | $53.51 | $56.18 | $50.67 | $51.79 | -3.20% | 17,099,701 |
| Sep 2016 | $51.91 | $53.99 | $48.13 | $53.50 | +3.24% | 25,037,000 |
| Aug 2016 | $45.55 | $53.63 | $43.51 | $51.82 | +13.29% | 23,358,800 |
| Jul 2016 | $42.84 | $47.82 | $40.25 | $45.74 | +6.57% | 17,960,000 |
| Jun 2016 | $43.90 | $47.60 | $39.48 | $42.92 | -2.74% | 30,585,900 |
| May 2016 | $50.42 | $50.66 | $41.67 | $44.13 | -12.07% | 24,898,200 |
| Apr 2016 | $45.53 | $52.82 | $43.51 | $50.19 | +8.40% | 17,800,800 |
| Mar 2016 | $43.88 | $49.58 | $42.49 | $46.30 | +7.37% | 19,731,300 |
| Feb 2016 | $45.07 | $47.02 | $39.90 | $43.12 | -5.19% | 24,429,300 |
| Jan 2016 | $53.93 | $54.07 | $40.44 | $45.48 | -16.27% | 21,487,500 |
| Dec 2015 | $60.48 | $60.65 | $51.97 | $54.32 | -9.54% | 11,779,900 |
| Nov 2015 | $60.13 | $63.56 | $56.54 | $60.05 | -0.37% | 14,838,700 |
| Oct 2015 | $51.90 | $61.53 | $51.30 | $60.27 | +16.15% | 17,485,700 |
| Sep 2015 | $53.29 | $55.76 | $49.26 | $51.89 | -6.05% | 24,000,300 |
| Aug 2015 | $62.20 | $67.84 | $50.01 | $55.23 | -11.59% | 17,866,000 |
| Jul 2015 | $69.05 | $69.17 | $59.14 | $62.47 | -8.92% | 13,139,000 |
| Jun 2015 | $70.73 | $74.10 | $67.92 | $68.59 | -2.72% | 12,286,800 |
| May 2015 | $78.07 | $78.89 | $68.39 | $70.51 | -9.58% | 22,073,100 |
| Apr 2015 | $72.35 | $79.25 | $70.34 | $77.98 | +8.40% | 15,997,100 |
| Mar 2015 | $66.76 | $72.72 | $64.00 | $71.94 | +7.76% | 18,799,500 |
| Feb 2015 | $57.77 | $72.06 | $57.77 | $66.76 | +16.49% | 19,171,400 |
| Jan 2015 | $61.18 | $62.09 | $54.15 | $57.31 | -6.19% | 15,968,800 |
| Dec 2014 | $63.13 | $65.33 | $53.43 | $61.09 | -3.95% | 21,097,700 |
| Nov 2014 | $70.85 | $73.42 | $62.30 | $63.60 | -9.85% | 18,755,100 |
| Oct 2014 | $86.23 | $86.23 | $66.32 | $70.55 | -18.52% | 28,377,200 |
| Sep 2014 | $97.25 | $98.44 | $86.53 | $86.59 | -10.85% | 11,034,700 |
| Aug 2014 | $86.91 | $97.16 | $84.03 | $97.13 | +11.15% | 10,153,900 |
| Jul 2014 | $84.15 | $91.97 | $83.25 | $87.39 | +4.33% | 12,134,200 |
| Jun 2014 | $80.71 | $85.01 | $80.38 | $83.76 | +3.60% | 10,119,700 |
| May 2014 | $71.07 | $81.51 | $70.41 | $80.85 | +13.55% | 18,418,600 |
| Apr 2014 | $66.45 | $73.38 | $61.71 | $71.20 | +7.59% | 14,662,100 |
| Mar 2014 | $65.86 | $69.41 | $63.25 | $66.18 | -0.73% | 11,757,600 |
| Feb 2014 | $60.56 | $67.92 | $58.10 | $66.67 | +9.70% | 17,418,200 |
| Jan 2014 | $60.56 | $62.32 | $57.01 | $60.77 | -0.43% | 15,854,800 |
| Dec 2013 | $56.84 | $61.08 | $55.51 | $61.04 | +8.43% | 12,179,520 |
| Nov 2013 | $53.75 | $58.69 | $53.12 | $56.29 | +4.80% | 17,782,600 |
| Oct 2013 | $52.98 | $56.37 | $51.75 | $53.71 | +2.64% | 14,356,800 |
| Sep 2013 | $51.29 | $53.90 | $50.57 | $52.33 | +3.44% | 13,969,800 |
| Aug 2013 | $52.73 | $53.17 | $49.19 | $50.59 | -2.73% | 16,886,000 |
| Jul 2013 | $48.45 | $53.56 | $47.93 | $52.01 | +7.89% | 16,999,200 |
| Jun 2013 | $46.98 | $49.76 | $44.96 | $48.21 | +3.22% | 20,397,800 |
| May 2013 | $41.38 | $47.72 | $39.23 | $46.70 | +12.34% | 27,599,600 |
| Apr 2013 | $46.51 | $46.58 | $38.36 | $41.57 | -11.08% | 27,911,200 |
| Mar 2013 | $43.39 | $49.14 | $42.43 | $46.75 | +8.44% | 17,903,800 |
| Feb 2013 | $46.13 | $46.94 | $41.76 | $43.11 | -6.14% | 20,013,200 |
| Jan 2013 | $40.80 | $47.03 | $40.71 | $45.93 | +15.84% | 20,343,400 |
| Dec 2012 | $36.70 | $40.23 | $35.86 | $39.65 | +9.52% | 18,564,800 |
| Nov 2012 | $38.15 | $40.09 | $34.51 | $36.21 | -4.80% | 24,262,800 |
| Oct 2012 | $37.06 | $40.25 | $35.00 | $38.03 | +4.11% | 22,583,600 |
| Sep 2012 | $34.52 | $38.23 | $34.13 | $36.53 | +6.22% | 17,212,800 |
| Aug 2012 | $30.00 | $35.08 | $29.32 | $34.39 | +15.87% | 23,977,600 |
| Jul 2012 | $26.32 | $30.50 | $25.43 | $29.68 | +13.59% | 17,122,200 |
| Jun 2012 | $26.51 | $26.80 | $24.07 | $26.13 | -4.09% | 25,711,400 |
| May 2012 | $30.50 | $32.57 | $25.58 | $27.25 | -14.79% | 31,325,000 |
| Apr 2012 | $32.40 | $32.96 | $29.44 | $31.98 | -1.30% | 18,175,200 |
| Mar 2012 | $30.17 | $33.46 | $28.05 | $32.40 | +7.57% | 19,124,200 |
| Feb 2012 | $28.75 | $31.71 | $28.25 | $30.12 | +3.05% | 18,399,000 |
| Jan 2012 | $20.55 | $29.29 | $20.19 | $29.23 | +45.25% | 25,655,600 |
| Dec 2011 | $21.03 | $21.41 | $18.84 | $20.12 | -4.19% | 9,987,800 |
| Nov 2011 | $19.03 | $22.11 | $17.58 | $21.00 | +1.92% | 18,362,600 |
| Oct 2011 | $16.94 | $21.70 | $15.63 | $20.61 | +20.22% | 17,874,000 |
| Sep 2011 | $22.91 | $23.20 | $17.10 | $17.14 | -25.40% | 15,410,800 |
| Aug 2011 | $26.34 | $26.84 | $17.77 | $22.98 | -11.21% | 29,470,400 |
| Jul 2011 | $26.07 | $27.72 | $24.51 | $25.88 | -0.29% | 18,536,400 |
| Jun 2011 | $28.07 | $28.18 | $23.94 | $25.95 | -7.49% | 26,528,200 |
| May 2011 | $33.09 | $33.89 | $25.46 | $28.05 | -14.55% | 28,690,600 |
| Apr 2011 | $28.44 | $33.75 | $27.83 | $32.83 | +16.81% | 14,924,800 |
| Mar 2011 | $23.95 | $28.24 | $23.26 | $28.10 | +17.55% | 14,676,000 |
| Feb 2011 | $19.52 | $24.96 | $19.42 | $23.91 | +23.48% | 14,712,400 |
| Jan 2011 | $21.96 | $22.08 | $19.10 | $19.36 | -10.93% | 9,495,400 |
| Dec 2010 | $19.27 | $21.97 | $19.04 | $21.74 | +15.12% | 7,680,800 |
| Nov 2010 | $16.07 | $19.34 | $15.79 | $18.88 | +18.15% | 10,458,000 |
| Oct 2010 | $15.18 | $16.49 | $14.62 | $15.98 | +6.78% | 10,162,000 |
| Sep 2010 | $13.18 | $15.37 | $13.15 | $14.97 | +15.47% | 8,675,800 |
| Aug 2010 | $12.75 | $14.53 | $12.34 | $12.96 | +4.77% | 11,033,800 |
| Jul 2010 | $9.22 | $12.75 | $8.67 | $12.37 | +33.23% | 10,159,200 |
| Jun 2010 | $10.38 | $10.56 | $9.18 | $9.29 | -12.45% | 9,790,800 |
| May 2010 | $14.07 | $14.59 | $9.82 | $10.61 | -24.47% | 10,731,400 |
| Apr 2010 | $13.01 | $15.05 | $12.95 | $14.04 | +8.88% | 9,226,800 |
| Mar 2010 | $10.32 | $13.05 | $10.32 | $12.90 | +27.36% | 10,713,400 |
| Feb 2010 | $10.30 | $11.05 | $9.60 | $10.13 | -1.36% | 8,195,800 |
| Jan 2010 | $12.59 | $12.82 | $10.22 | $10.27 | -17.65% | 4,945,000 |
| Dec 2009 | $13.19 | $13.37 | $12.10 | $12.47 | -4.67% | 5,029,200 |
| Nov 2009 | $12.29 | $13.97 | $12.00 | $13.08 | +7.66% | 5,789,400 |
| Oct 2009 | $12.82 | $13.78 | $11.97 | $12.15 | -5.49% | 5,043,800 |
| Sep 2009 | $11.98 | $14.11 | $11.56 | $12.85 | +6.91% | 5,189,800 |
| Aug 2009 | $12.65 | $13.28 | $11.64 | $12.02 | -3.80% | 6,029,800 |
| Jul 2009 | $10.25 | $12.90 | $9.40 | $12.50 | +22.56% | 9,132,000 |
| Jun 2009 | $10.40 | $11.29 | $9.57 | $10.20 | -0.29% | 8,018,200 |
| May 2009 | $9.30 | $11.08 | $9.14 | $10.23 | +9.36% | 10,769,800 |
| Apr 2009 | $7.18 | $9.84 | $7.10 | $9.35 | +27.82% | 9,946,600 |
| Mar 2009 | $6.11 | $8.23 | $5.15 | $7.32 | +17.13% | 13,466,400 |
| Feb 2009 | $6.79 | $7.74 | $6.23 | $6.25 | -8.63% | 9,872,600 |
| Jan 2009 | $8.16 | $8.50 | $6.55 | $6.84 | -16.08% | 9,641,400 |
| Dec 2008 | $8.25 | $8.43 | $7.00 | $8.15 | -3.50% | 13,265,400 |
| Nov 2008 | $9.08 | $9.27 | $5.80 | $8.44 | -7.41% | 12,672,200 |
| Oct 2008 | $10.40 | $11.11 | $7.01 | $9.12 | -13.31% | 18,932,800 |
| Sep 2008 | $9.65 | $11.33 | $8.75 | $10.52 | +10.80% | 23,580,200 |
| Aug 2008 | $8.70 | $10.72 | $7.96 | $9.49 | +8.40% | 18,839,800 |
| Jul 2008 | $7.32 | $8.94 | $6.36 | $8.76 | +17.83% | 15,399,600 |
| Jun 2008 | $8.68 | $8.87 | $7.43 | $7.43 | -14.35% | 15,099,200 |
| May 2008 | $7.38 | $8.90 | $6.85 | $8.68 | +3.83% | 17,704,400 |
| Apr 2008 | $6.48 | $9.64 | $6.48 | $8.36 | +28.05% | 22,710,600 |
| Mar 2008 | $7.96 | $8.63 | $6.26 | $6.53 | -19.14% | 18,822,400 |
| Feb 2008 | $10.00 | $11.11 | $7.79 | $8.07 | -20.10% | 15,606,600 |
| Jan 2008 | $9.52 | $10.12 | $7.41 | $10.10 | +6.37% | 19,433,000 |
| Dec 2007 | $9.81 | $10.74 | $9.17 | $9.50 | -3.95% | 11,153,800 |
| Nov 2007 | $11.88 | $12.18 | $9.30 | $9.89 | -19.44% | 17,063,800 |
| Oct 2007 | $12.62 | $13.33 | $11.39 | $12.27 | -3.12% | 16,913,200 |
| Sep 2007 | $13.65 | $14.63 | $12.19 | $12.67 | -6.39% | 17,915,600 |
| Aug 2007 | $12.80 | $16.43 | $12.73 | $13.53 | +8.33% | 33,985,600 |
| Jul 2007 | $14.09 | $15.00 | $12.26 | $12.49 | -11.17% | 19,934,000 |
| Jun 2007 | $14.15 | $15.08 | $13.70 | $14.06 | +0.25% | 16,844,200 |
| May 2007 | $14.65 | $16.54 | $13.67 | $14.03 | -3.91% | 25,240,600 |
| Apr 2007 | $13.80 | $15.65 | $13.32 | $14.60 | +7.51% | 17,347,200 |
| Mar 2007 | $14.73 | $14.77 | $13.24 | $13.58 | -8.68% | 27,977,000 |
| Feb 2007 | $16.75 | $18.57 | $14.70 | $14.87 | -10.40% | 28,986,400 |
| Jan 2007 | $15.71 | $16.59 | $15.14 | $16.59 | +5.74% | 24,252,000 |
| Dec 2006 | $16.38 | $17.45 | $15.51 | $15.69 | -4.18% | 20,666,400 |
| Nov 2006 | $15.88 | $17.67 | $15.59 | $16.38 | +3.80% | 19,654,800 |
| Oct 2006 | $15.94 | $17.31 | $15.32 | $15.78 | -1.44% | 13,535,800 |
| Sep 2006 | $14.92 | $16.80 | $14.55 | $16.01 | +6.84% | 12,192,400 |
| Aug 2006 | $13.68 | $15.52 | $13.51 | $14.98 | +9.34% | 14,414,200 |
| Jul 2006 | $14.95 | $15.49 | $13.13 | $13.70 | -8.05% | 9,589,400 |
| Jun 2006 | $15.68 | $15.98 | $13.19 | $14.90 | -4.55% | 17,026,600 |
| May 2006 | $15.33 | $17.36 | $14.83 | $15.61 | +2.87% | 20,222,200 |
| Apr 2006 | $17.28 | $17.49 | $14.91 | $15.18 | -12.16% | 22,486,000 |
| Mar 2006 | $17.20 | $18.67 | $16.25 | $17.28 | +0.67% | 11,256,400 |
| Feb 2006 | $15.71 | $17.74 | $15.25 | $17.16 | +9.30% | 6,655,000 |
| Jan 2006 | $14.45 | $16.50 | $13.87 | $15.70 | +8.99% | 4,453,200 |
| Dec 2005 | $14.08 | $15.45 | $13.53 | $14.41 | +2.82% | 6,083,000 |
| Nov 2005 | $14.55 | $15.80 | $14.01 | $14.01 | -3.71% | 5,508,400 |
| Oct 2005 | $13.59 | $14.76 | $12.97 | $14.55 | +7.46% | 7,283,000 |
| Sep 2005 | $13.70 | $14.98 | $12.68 | $13.54 | -1.53% | 8,207,800 |
| Aug 2005 | $15.86 | $16.49 | $12.78 | $13.75 | -13.03% | 10,764,400 |
| Jul 2005 | $12.23 | $16.60 | $12.17 | $15.81 | +29.06% | 8,239,000 |
| Jun 2005 | $12.03 | $13.05 | $11.63 | $12.25 | +2.17% | 9,499,600 |
| May 2005 | $13.08 | $14.34 | $11.01 | $11.99 | -8.65% | 10,570,600 |
| Apr 2005 | $16.25 | $16.79 | $12.88 | $13.13 | -18.86% | 11,081,600 |
| Mar 2005 | $17.45 | $18.85 | $15.51 | $16.18 | -6.72% | 11,321,200 |
| Feb 2005 | $15.65 | $18.29 | $15.10 | $17.34 | +10.45% | 8,869,400 |
| Jan 2005 | $16.67 | $17.30 | $15.23 | $15.70 | -5.99% | 5,521,800 |
| Dec 2004 | $15.85 | $17.61 | $14.19 | $16.70 | +6.40% | 8,496,200 |
| Nov 2004 | $11.61 | $15.83 | $11.50 | $15.70 | +36.06% | 8,218,400 |
| Oct 2004 | $11.23 | $11.90 | $10.67 | $11.54 | +3.45% | 5,919,800 |
| Sep 2004 | $8.84 | $11.45 | $8.84 | $11.15 | +27.43% | 8,067,200 |
| Aug 2004 | $7.30 | $9.03 | $7.27 | $8.75 | – | 6,332,000 |
Seasonality
WLK return in each calendar month over the last 10 years, including dividends. The current month runs to the latest close.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average | 3.6% | 3.9% | -0.3% | 0.1% | -3.3% | -0.6% | 1.4% | 1.5% | -2.4% | -1.1% | 5.9% | 2.2% |
| Months up | 6 of 10 | 5 of 10 | 6 of 10 | 4 of 10 | 5 of 10 | 5 of 10 | 5 of 10 | 6 of 10 | 5 of 10 | 5 of 10 | 6 of 9 | 6 of 9 |
| 2026 | 7.3% | 32.9% | 11.4% | -1.3% | -24.2% | -15.9% | -3.4% | 7.2% | -17.0% | 9.6% | ||
| 2025 | -0.3% | -1.7% | -10.5% | -7.6% | -22.6% | 6.9% | 4.4% | 11.5% | -12.3% | -10.7% | -2.1% | 10.7% |
| 2024 | -1.2% | 0.6% | 10.2% | -3.6% | 9.3% | -9.8% | 2.1% | -1.3% | 3.3% | -12.2% | -2.3% | -10.7% |
| 2023 | 19.7% | -2.7% | -2.7% | -1.9% | -8.4% | 14.9% | 15.1% | -4.4% | -4.8% | -7.5% | 11.7% | 9.0% |
| 2022 | 1.6% | 12.1% | 11.9% | 2.6% | 4.6% | -25.8% | -0.7% | 1.7% | -11.9% | 11.2% | 11.8% | -4.7% |
| 2021 | -6.3% | 11.9% | 4.1% | 5.7% | 7.7% | -10.7% | -8.0% | 5.7% | 4.3% | 6.8% | -4.2% | 4.5% |
| 2020 | -12.8% | -8.3% | -31.7% | 13.8% | 10.4% | 12.5% | 1.6% | 9.4% | 6.6% | 7.0% | 11.5% | 8.6% |
| 2019 | 11.7% | -5.1% | -2.9% | 2.8% | -17.5% | 21.2% | -2.7% | -12.9% | 11.8% | -3.6% | 9.1% | 2.1% |
| 2018 | 5.7% | -3.7% | 2.7% | -3.8% | 8.4% | -7.0% | -0.4% | -11.6% | -12.1% | -14.2% | 2.0% | -8.7% |
| 2017 | 10.6% | 2.8% | 4.1% | -5.8% | -1.0% | 7.7% | 6.3% | 9.6% | 8.0% | 2.2% | 15.6% | 8.8% |